Question

If G varies inversely as r, and G = 18 when r= 4, find G when r= 6

Answer 1

The model to use here is   y = k/x.

If g =18 when r = 4, then 18 = k/4.  Solving for k, k = 72.

Then g = 72/r.  If r = 6, g = 72/6 = 12 (answer)